package day11;

import java.util.concurrent.locks.ReentrantReadWriteLock;

//测试读写锁
public class TestReadWrite {
    Object data;//数据
    ReentrantReadWriteLock rwlock=
            new ReentrantReadWriteLock();
    public void read(){
        try {
            String name=Thread.currentThread().getName();
            rwlock.readLock().lock();
            //怎么读取
            System.out.println(name+"开始读取2S数据:"+data);
            Thread.sleep(2000);
            System.out.println(name+"结束读取2S数据:"+data);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            rwlock.readLock().unlock();
        }
    }
    public void write(Object data){
        try {
            String name=Thread.currentThread().getName();
            rwlock.writeLock().lock();
            //怎么写入
            System.out.println(name+"开始写入2S数据:"+data);
            Thread.sleep(2000);
            this.data=data;
            System.out.println(name+"结束写入2S数据:"+data);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            rwlock.writeLock().unlock();
        }
    }
    public static void main(String[] args) {
        TestReadWrite trw=new TestReadWrite();
        for(int i=0;i<3;i++){
            new Thread(()->{
                for(int j=0;j<5;j++){
                    trw.read();
                }
            },"读:"+i).start();
            new Thread(()->{
                for(int j=0;j<5;j++){
                    trw.write(System.currentTimeMillis());
                }
            },"写:"+i).start();
        }
    }
}
